// jQuery Alert Dialogs Plugin
//
// Version 1.1
//
// Cory S.N. LaViska
// A Beautiful Site (http://abeautifulsite.net/)
// 14 May 2009
//
// Visit http://abeautifulsite.net/notebook/87 for more information
//
// Usage:
//		jAlert( message, [title, callback] )
//		jConfirm( message, [title, callback] )
//		jPrompt( message, [value, title, callback] )
//
// History:
//
//		1.00 - Released (29 December 2008)
//
//		1.01 - Fixed bug where unbinding would destroy all resize events
//
// License:
//
// This plugin is dual-licensed under the GNU General Public License and the MIT License and
// is copyright 2008 A Beautiful Site, LLC.
//
(function ($) {

	$.alerts = {
		// These properties can be read/written by accessing $.alerts.propertyName from your scripts at any time
		verticalOffset: -75,
		// vertical offset of the dialog from center screen, in pixels
		horizontalOffset: 0,
		// horizontal offset of the dialog from center screen, in pixels/
		repositionOnResize: true,
		// re-centers the dialog on window resize
		overlayOpacity: .01,
		// transparency level of overlay
		overlayColor: '#FFF',
		// base color of overlay
		draggable: true,
		// make the dialogs draggable (requires UI Draggables plugin)
		okButton: '&nbsp;确&nbsp;&nbsp;定&nbsp;',
		// text for the OK button
		cancelButton: '&nbsp;取&nbsp;&nbsp;消&nbsp;',
		// text for the Cancel button
		dialogClass: null,
		// if specified, this class will be applied to all dialogs
		// Public methods
		alert: function (message, title, callback) {
			if (title == null)
				title = '提示';
			$.alerts._show(title, message, null, 'alert',
					function (result) {
						if (callback)
							callback(result);
					});
		},
		confirm: function (message, title, callback) {
			if (title == null)
				title = '请确认';
			$.alerts._show(title, message, null, 'confirm',
					function (result) {
						if (callback)
							callback(result);
					});
		},
		prompt: function (message, value, title, callback) {
			if (title == null)
				title = '请输入';
			$.alerts._show(title, message, value, 'prompt',
					function (result) {
						if (callback)
							callback(result);
					});
		},
		// Private methods
		_show: function (title, msg, value, type, callback) {

			$.alerts._hide();
			$.alerts._overlay('show');

			$("BODY").append('<div id="popup_container">' + '<h1 id="popup_title"></h1>' + '<div id="popup_content">' + '<div id="popup_message"></div>' + '</div>' + '</div>');

			if ($.alerts.dialogClass)
				$("#popup_container").addClass($.alerts.dialogClass);

			// IE6 Fix
			var pos = ($.browser.msie && parseInt($.browser.version) <= 6) ? 'absolute' : 'fixed';

			$("#popup_container").css({
				position: pos,
				zIndex: 99999,
				padding: 0,
				margin: 0
			});

			$("#popup_title").text(title);
			$("#popup_content").addClass(type);
			$("#popup_message").text(msg);
			$("#popup_message").html($("#popup_message").text().replace(/\n/g, '<br />'));

			$("#popup_container").css({
				minWidth: $("#popup_container").outerWidth(),
				maxWidth: $("#popup_container").outerWidth()
			});

			$.alerts._reposition();
			$.alerts._maintainPosition(true);

			switch (type) {
				case 'alert':
					$("#popup_message").after('<div id="popup_panel"><input type="button" value="' + $.alerts.okButton + '" id="popup_ok" /></div>');
					$("#popup_ok").click(function () {
						$.alerts._hide();
						callback(true);
					});
					$("#popup_ok").focus().keypress(function (e) {
						if (e.keyCode == 13 || e.keyCode == 27)
							$("#popup_ok").trigger('click');
					});
					break;
				case 'confirm':
					$("#popup_message").after('<div id="popup_panel"><input type="button" value="' + $.alerts.okButton + '" id="popup_ok" /> <input type="button" value="' + $.alerts.cancelButton + '" id="popup_cancel" /></div>');
					$("#popup_ok").click(function () {
						$.alerts._hide();
						if (callback)
							callback(true);
					});
					$("#popup_cancel").click(function () {
						$.alerts._hide();
						if (callback)
							callback(false);
					});
					$("#popup_ok").focus();
					$("#popup_ok, #popup_cancel").keypress(function (e) {
						if (e.keyCode == 13)
							$("#popup_ok").trigger('click');
						if (e.keyCode == 27)
							$("#popup_cancel").trigger('click');
					});
					break;
				case 'prompt':
					$("#popup_message").append('<br /><input type="text" size="30" id="popup_prompt" />').after('<div id="popup_panel"><input type="button" value="' + $.alerts.okButton + '" id="popup_ok" /> <input type="button" value="' + $.alerts.cancelButton + '" id="popup_cancel" /></div>');
					$("#popup_prompt").width($("#popup_message").width());
					$("#popup_ok").click(function () {
						var val = $("#popup_prompt").val();
						$.alerts._hide();
						if (callback)
							callback(val);
					});
					$("#popup_cancel").click(function () {
						$.alerts._hide();
						if (callback)
							callback(null);
					});
					$("#popup_prompt, #popup_ok, #popup_cancel").keypress(function (e) {
						if (e.keyCode == 13)
							$("#popup_ok").trigger('click');
						if (e.keyCode == 27)
							$("#popup_cancel").trigger('click');
					});
					if (value)
						$("#popup_prompt").val(value);
					$("#popup_prompt").focus().select();
					break;
			}

			// Make draggable
			if ($.alerts.draggable) {
				try {
					$("#popup_container").draggable({
						handle: $("#popup_title")
					});
					$("#popup_title").css({
						cursor: 'move'
					});
				} catch (e) {
					/* requires jQuery UI draggables */
				}
			}
		},
		_hide: function () {
			$("#popup_container").remove();
			$.alerts._overlay('hide');
			$.alerts._maintainPosition(false);
		},
		_overlay: function (status) {
			switch (status) {
				case 'show':
					$.alerts._overlay('hide');
					$("BODY").append('<div id="popup_overlay"></div>');
					$("#popup_overlay").css({
						position:
								'absolute',
						zIndex: 99998,
						top: '0px',
						left: '0px',
						width: '100%',
						height: $(document).height(),
						background: $.alerts.overlayColor,
						opacity: $.alerts.overlayOpacity
					});
					break;
				case 'hide':
					$("#popup_overlay").remove();
					break;
			}
		},
		_reposition: function () {
			var top = (($(window).height() / 2) - ($("#popup_container").outerHeight() / 2)) + $.alerts.verticalOffset;
			var left = (($(window).width() / 2) - ($("#popup_container").outerWidth() / 2)) + $.alerts.horizontalOffset;
			if (top < 0)
				top = 0;
			if (left < 0)
				left = 0;

			// IE6 fix
			if ($.browser.msie && parseInt($.browser.version) <= 6)
				top = top + $(window).scrollTop();

			$("#popup_container").css({
				top: top + 'px',
				left: left + 'px'
			});
			$("#popup_overlay").height($(document).height());
		},
		_maintainPosition: function (status) {
			if ($.alerts.repositionOnResize) {
				switch (status) {
					case true:
						$(window).bind('resize', $.alerts._reposition);
						break;
					case false:
						$(window).unbind('resize', $.alerts._reposition);
						break;
				}
			}
		}
	};

	// Shortuct functions
	jAlert = function (message, title, callback) {
		$.alerts.alert(message, title, callback);
	};

	jConfirm = function (message, title, callback) {
		$.alerts.confirm(message, title, callback);
	};

	jPrompt = function (message, value, title, callback) {
		$.alerts.prompt(message, value, title, callback);
	};

})(jQuery);